20512806 has 20 divisors (see below), whose sum is σ = 42002412. Its totient is φ = 6678588.

The previous prime is 20512771. The next prime is 20512841. The reversal of 20512806 is 60821502.

It is an interprime number because it is at equal distance from previous prime (20512771) and next prime (20512841).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 477021 + ... + 477063.

Almost surely, 2^20512806 is an apocalyptic number.

20512806 is an abundant number, since it is smaller than the sum of its proper divisors (21489606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20512806 is an frugal number, since it uses more digits than its factorization.

20512806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20512806 is about 4529.1065344061. The cubic root of 20512806 is about 273.7421606979.

Multiplying 20512806 by its sum of digits (24), we get a square (492307344 = 22188²).

The spelling of 20512806 in words is "twenty million, five hundred twelve thousand, eight hundred six".